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Equipment Discussions >> Binoculars

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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Pulled the Trigger on Oberwerk BT-70-45 Binoculars new
      #6148331 - 10/20/13 12:24 PM

This fall I found myself using my 15x70 binoculars more and more and really loved the 2 eyed viewing experience, the ease of use and mostly the ability of taking in the big picture (which is how I started this hobby over a year and a half ago before I got a slight touch aperture fever ). My problem however is that I get pretty bad neck strain above 45 degree viewing. Im fine up to 40degrees or so but above 45 its really bothersome. So when my lovely wife offered me some astro equipment for my upcoming 50th Birthday, I immediately jumped on the BT70. I think Im going to love these binos, especially at the cottage where I get Mag 6.5 skies. And the fact that I can increase magnification is just icing on the cake . Now, they are back ordered but I should have them by December at the latest (in time for my birthday ).


I think these will also complement my 127Mak when I choose to use them in tandem. The BT-70 are good to a magnification of 47X and the Mak cannot really go below 48X. Also, the Binoculars will be a great grab and go instrument on cold winter nights when I dont want to be out for too long.

Eric


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JustaBoy
Post Laureate
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Reged: 06/19/12

Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6148374 - 10/20/13 12:51 PM

+1...!!!!!!!!!!!

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daniel_h
Carpal Tunnel
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Reged: 03/08/08

Loc: VIC, Australia
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: JustaBoy]
      #6148733 - 10/20/13 05:18 PM

70mm is a sweet spot in binos imo, almost a goldilocks

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GlennLeDrew
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: daniel_h]
      #6148820 - 10/20/13 06:09 PM

Is this the newer MkII, which uses 1.25" eyepieces and utilizes the full aperture? (As opposed to the first iteration which employed proprietary eyepieces and worked at 60mm aperture?)

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JustaBoy
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Reged: 06/19/12

Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: GlennLeDrew]
      #6148855 - 10/20/13 06:27 PM

http://www.bigbinoculars.com/70bt45.htm

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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: GlennLeDrew]
      #6148876 - 10/20/13 06:37 PM

This one does use 1.25" eyepieces and from what I have read it has the full 70mm aperture.

Eric

p.s. Happy Birthday


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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: daniel_h]
      #6148888 - 10/20/13 06:46 PM

I have to agree about the sweet spot. I am amazed with what I can see with my current 15x70, and they are not even working at full aperture. From what I understand these bt70's would be equivalent to an 80mm apo for both contrast and light gathering, which will be great under dark skies.

Eric


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JustaBoy
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Reged: 06/19/12

Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6148930 - 10/20/13 07:11 PM

There's nothing APO about them, so why do you say that?

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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: JustaBoy]
      #6148948 - 10/20/13 07:21 PM

Well first of all they are a triplet and from reading previous post from EDz, a 70mm binocular is roughly equivalent to an 84mm scope (for light gathering and contrast but not for resolution). Now, I'm not buying these because I think they are an APO, I'm buying these because I prefer two eyed viewing and I love the wide field views that I will get. I was considering an 80ed at one point but I did not want to compete with my Mak at the high magnification end and I prefer two eyes at the lower end.

Eric


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JustaBoy
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Reged: 06/19/12

Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6148997 - 10/20/13 07:44 PM

Understood - Please understand that I am happy for you, and would love to have a pair for myself, but the fact that they are a triplet really doesn't count towards improved performance. They are still just an Achro.

-Chuck


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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: JustaBoy]
      #6149008 - 10/20/13 07:49 PM

You may be right Chuck, but since I'm buying these for low power views it doesn't really matter. I guess that when I hear the word triplet I automatically think APO

Eric


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Jarrod
Pooh-Bah
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Reged: 01/20/13

Loc: SE USA
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6149024 - 10/20/13 07:58 PM

Yes, it's a triplet, but it's an f/5 made of relatively inexpensive high-refractive-index glass. So while they are well-corrected for what they are, you aren't going to achieve true apo performance. The 20x80 deluxe III triplet is good, but does show a thin blue (or is it green?) line around the full moon. But the design produces good contrast. If the 70 triplet is like the 80, I think you'll be pleased.

Edited by Jarrod (10/20/13 08:06 PM)


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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Jarrod]
      #6149031 - 10/20/13 08:05 PM

Thank you Jarrod, I was not aware of the type of glass. I never found the moon to be an issue when I had my 4"f5 achro, but Jupiter was another story altogether. Anyway, I have other instruments for those objects. I really like my 15X70 Skymasters and I think that these will be even better.

Eric


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JustaBoy
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Reged: 06/19/12

Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6149043 - 10/20/13 08:14 PM

I think you will Love them, Eric... Now start putting your coins aside for $Pairs$ of eyepieces:-)

It's great fun!
-Chuck


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Rich V.
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Reged: 01/02/05

Loc: Lake Tahoe area, Nevada, USA
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: GlennLeDrew]
      #6149048 - 10/20/13 08:20 PM

Quote:

Is this the newer MkII, which uses 1.25" eyepieces and utilizes the full aperture? (As opposed to the first iteration which employed proprietary eyepieces and worked at 60mm aperture?)




Glenn, I think you're thinking of the 90 Garrett MKII; I believe Mr. Bill determined that these Obie 45 BTs were only 60mm effective. There is no MKII 45.

Rich


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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars [Re: JustaBoy]
      #6149058 - 10/20/13 08:37 PM

Yes, my wife said that I get the binoculars for my birthday... but everything else is up to me

I'm really looking forward to them, thanks for the input.

Eric


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GlennLeDrew
Postmaster
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6149252 - 10/21/13 02:41 AM

Rich,
Oops; I was indeed thinking of the 90 degree version! I must read thread titles more carefully. I wonder if the objective is different between the two?

Eric,
I have on hand for examination--and overdue for return--the 90 degree version of the Mk II 70mm BT. It has achromat-like chromatic aberration; it's certainly not APO-like.

I assume the prism rear aperture will be fairly similar. If so, a 19mm Panoptic is a wonderful eyepiece for it. Even a 24mm Pan is quite useable, albeit with a *very* small and not too objectionable edge darkening, which delivers the widest true field possible at a nice AFoV and with excellent correction across the great bulk of the field. I've tried both these eyepieces, as well as some of a friend's Naglers.


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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: GlennLeDrew]
      #6149369 - 10/21/13 07:50 AM

I guess I am still learning about scope and binocular design But that all part of the fun!

Thanks for the info Glen. I'm really looking forward to getting these. Let me know if you are interested in taking a look at them when they come in.

Eric


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JustaBoy
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Reged: 06/19/12

Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: Eric63]
      #6149526 - 10/21/13 09:49 AM

Eric,
Unless my eyeballs are failing me again, these are 60mm (effective), and you are still getting them?

-Chuck


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Eric63
scholastic sledgehammer


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Pulled the Trigger on Oberwerk BT-70-45 Binoculars new [Re: JustaBoy]
      #6149555 - 10/21/13 10:08 AM

I'm going to have to look into this further. I had read that they were at full aperture. Thanks for the heads up.

Eric


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